C-X-C motif ligand 8 upregulates the expression of the PI3K/AKT/mTOR pathway in tumor cells, promotes the proliferation and epithelial-mesenchymal transition of tumor cells, and enhances the expression of PD-L1 on the BC cell membrane, which is detrimental to the long-term prognosis of patients (71). The gene discussed is AKT1; the disease is neoplasm.